Hi there,
I have a 2003 DII SE w/ 130,000 miles on it. My brother in law took it to a Jiffy Lube for an oil change and apparently they did not tighten the oil filter so there was quite a bit of oil on the garage floor. I assume that the oil spilled on the O2 sensor. But in the meantime, I got these 3 codes. This all happened in within a day.
Do you guys think that the codes and the oil spill are related? If not, can it be a dead MAF? If not, do I have to change all 4 O2 sensors or just the one that gives the code? How hard is it for a novice and what tools do I need?
Thanks
Bob

 

Looks like a bad O2 sensor on the passenger pre cat side. It's not a dead code so its not a slam dunk but that is where I would start. Replace all 4 if they are original. And its not from the leak. You need a (17mm?) O2 sensor wrench and your average assortment of socket extensions and ratchets. The hardest parts usually is the front sensors and getting the connections loose. Small girlish hands are a plus.

 

Thanks for the reply... What brand should I get? Denso, Bosch, NGK? Also is exact fit fine?
Thx

Bob

 

As long as they are plug and play you should be fine. I'm not sure I would mess with the universal kind unless you know what you are doing. Make sure the ones you get have a 1 year warranty (at least). I had 2 fail from AB but they sent new ones right away.

 

I have found Bosch fronts(upstream) at Advanced Auto in stock. Bosch Rears at AutoZone. On the Bosch website they recommend replacement @ 100,000 miles.
The driver's front is the hardest. The OEM brand O2 sensor removal tool is $9.99 at Autozone and is well worth it. If you have ramps to drive up on and a creeper it make the job 50% easier. I would add a little more antisieze on the threads. From the factory they are chintzy.

 

Thanks. I got the Bosch sensor from Autozone as well as the tool, total $91 incl tax.
I will try to do it this weekend.

 

With your mileage, I would suggest you replace all 4 02's if you want the proper air/fuel ration back into you engine.